iwlwifi: abstract out notification wait support

This will be sharable, but needs to live in the
op_mode as it is dependent on command processing.
Make a library out of the notification wait code.

Since I wrote all of the code originally and only
Intel employees changed it, we can also relicense
it to dual BSD/GPL.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 157 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-notif-wait.c b/drivers/net/wireless/iwlwifi/iwl-notif-wait.c
new file mode 100644
index 000000000000..88dc4a0f96b4
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-notif-wait.c
@@ -0,0 +1,157 @@
+/******************************************************************************
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2007 - 2012 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called LICENSE.GPL.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *****************************************************************************/
+#include <linux/sched.h>
+
+#include "iwl-notif-wait.h"
+
+
+void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
+{
+        spin_lock_init(&notif_wait->notif_wait_lock);
+        INIT_LIST_HEAD(&notif_wait->notif_waits);
+        init_waitqueue_head(&notif_wait->notif_waitq);
+}
+
+void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
+                                  struct iwl_rx_packet *pkt)
+{
+        if (!list_empty(&notif_wait->notif_waits)) {
+                struct iwl_notification_wait *w;
+
+                spin_lock(&notif_wait->notif_wait_lock);
+                list_for_each_entry(w, &notif_wait->notif_waits, list) {
+                        if (w->cmd != pkt->hdr.cmd)
+                                continue;
+                        w->triggered = true;
+                        if (w->fn)
+                                w->fn(notif_wait, pkt, w->fn_data);
+                }
+                spin_unlock(&notif_wait->notif_wait_lock);
+
+                wake_up_all(&notif_wait->notif_waitq);
+        }
+}
+
+void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
+{
+        unsigned long flags;
+        struct iwl_notification_wait *wait_entry;
+
+        spin_lock_irqsave(&notif_wait->notif_wait_lock, flags);
+        list_for_each_entry(wait_entry, &notif_wait->notif_waits, list)
+                wait_entry->aborted = true;
+        spin_unlock_irqrestore(&notif_wait->notif_wait_lock, flags);
+
+        wake_up_all(&notif_wait->notif_waitq);
+}
+
+
+void
+iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
+                           struct iwl_notification_wait *wait_entry,
+                           u8 cmd,
+                           void (*fn)(struct iwl_notif_wait_data *notif_wait,
+                                      struct iwl_rx_packet *pkt, void *data),
+                           void *fn_data)
+{
+        wait_entry->fn = fn;
+        wait_entry->fn_data = fn_data;
+        wait_entry->cmd = cmd;
+        wait_entry->triggered = false;
+        wait_entry->aborted = false;
+
+        spin_lock_bh(&notif_wait->notif_wait_lock);
+        list_add(&wait_entry->list, &notif_wait->notif_waits);
+        spin_unlock_bh(&notif_wait->notif_wait_lock);
+}
+
+int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
+                          struct iwl_notification_wait *wait_entry,
+                          unsigned long timeout)
+{
+        int ret;
+
+        ret = wait_event_timeout(notif_wait->notif_waitq,
+                                 wait_entry->triggered || wait_entry->aborted,
+                                 timeout);
+
+        spin_lock_bh(&notif_wait->notif_wait_lock);
+        list_del(&wait_entry->list);
+        spin_unlock_bh(&notif_wait->notif_wait_lock);
+
+        if (wait_entry->aborted)
+                return -EIO;
+
+        /* return value is always >= 0 */
+        if (ret <= 0)
+                return -ETIMEDOUT;
+        return 0;
+}
+
+void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
+                             struct iwl_notification_wait *wait_entry)
+{
+        spin_lock_bh(&notif_wait->notif_wait_lock);
+        list_del(&wait_entry->list);
+        spin_unlock_bh(&notif_wait->notif_wait_lock);
+}